We use it when emphasizing that we refer to one particular thing. For instance, "It is Lawrence you should be talking to". Or, "It was malaria that killed him." What pronoun should we apply when we ...

My wife, who is from northern New Jersey, USA, and who has a cold, was looking for a box of Kleenex/facial tissues this morning; she said to herself, "I need those box of tissues." This was not simply ...

On the NPR radio program Wait Wait Don't Tell Me (http://www.npr.org/programs/wait-wait-dont-tell-me/) Peter Sagal introduces the week's panelists using 'it's,' as in "She'll be performing Friday at ...

The existential 'there' is usually followed by a form of the verb 'to be', used as a pure copula.
For instance, rather than saying, a wrench is on the bench, you'd say there's a wrench on the bench.
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I've tried searching Google and StackExchange for this one, but I find it difficult to state the problem generally and therefore have had no luck so far; apologies if the answer is already out there ...